装载过程的函数调用顺序为：
initWithNibName:bundle/initWithCoder -> loadview -> viewDidLoad -> viewWillAppear -> viewWillLayoutSubviews -> viewDidlLayoutSubviews -> viewDiaAppearinitWithNibName:bundle/initWithCod
阅读背景：
视图加载生命周期
来源：互联网
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